/* ════════════════════════════════════════════════════════════
   艺语 AI 小说编辑器 — 样式表
   ════════════════════════════════════════════════════════════ */

/* ── CSS Variables ── */
:root {
  --primary: #4A90D9;
  --primary-hover: #3A7BC8;
  --primary-light: #EBF3FC;
  --primary-ghost: rgba(74,144,217,0.08);
  --bg: #F0F2F5;
  --surface: #FFFFFF;
  --surface-hover: #F8FAFC;
  --border: #E2E8F0;
  --border-light: #EDF2F7;
  --text: #1A202C;
  --text-secondary: #718096;
  --text-muted: #A0AEC0;
  --danger: #E53E3E;
  --danger-hover: #C53030;
  --danger-light: #FFF5F5;
  --success: #38A169;
  --success-light: #F0FFF4;
  --warning: #D69E2E;
  --sidebar-bg: #1E293B;
  --sidebar-text: #CBD5E1;
  --sidebar-active: #4A90D9;
  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --font-sans: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", sans-serif;
  --font-editor: "Georgia", "Noto Serif SC", "Source Han Serif SC", serif;
  --topbar-h: 52px;
  --sidebar-w: 72px;
  --chapter-list-w: 220px;
  --ai-panel-w: 320px;
  --transition: 0.2s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
input, textarea, select, button { font-family: inherit; font-size: inherit; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ══════════ Buttons ══════════ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 6px 14px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); cursor: pointer;
  font-size: 13px; transition: all var(--transition); white-space: nowrap; gap: 4px;
}
.btn:hover { background: var(--surface-hover); border-color: var(--text-muted); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-hover); border-color: var(--danger-hover); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--primary-ghost); color: var(--primary); }
.btn-sm { padding: 3px 8px; font-size: 12px; }
.btn-block { width: 100%; }
.btn-ai {
  flex: 1; padding: 8px 4px; background: var(--primary-light); color: var(--primary);
  border: 1px solid transparent; border-radius: var(--radius-sm); cursor: pointer;
  font-size: 13px; font-weight: 500; transition: all var(--transition);
}
.btn-ai:hover { background: var(--primary); color: #fff; }
.btn:disabled, .btn-ai:disabled { opacity: 0.5; cursor: not-allowed; }

/* ══════════ Top Bar ══════════ */
.topbar {
  height: var(--topbar-h); display: flex; align-items: center;
  padding: 0 16px; background: var(--surface); border-bottom: 1px solid var(--border);
  gap: 16px; z-index: 100; position: relative;
}
.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-center { flex: 1; text-align: center; }
.topbar-right { display: flex; align-items: center; gap: 8px; }
.logo {
  font-size: 20px; font-weight: 700; color: var(--primary);
  letter-spacing: 2px; user-select: none;
}
#novel-title {
  border: none; background: transparent; font-size: 15px; font-weight: 500;
  outline: none; width: 240px; padding: 4px 8px; border-radius: var(--radius-sm);
  transition: background var(--transition);
}
#novel-title:hover, #novel-title:focus { background: var(--primary-ghost); }
.word-count { font-size: 13px; color: var(--text-muted); }

/* Dropdown */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute; top: 100%; right: 0; margin-top: 4px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  min-width: 160px; z-index: 200; overflow: hidden;
}
.dropdown-menu button {
  display: block; width: 100%; padding: 8px 14px; text-align: left;
  border: none; background: none; cursor: pointer; font-size: 13px;
  transition: background var(--transition);
}
.dropdown-menu button:hover { background: var(--primary-light); color: var(--primary); }

/* ══════════ Main Layout ══════════ */
.main-layout {
  display: flex; height: calc(100vh - var(--topbar-h));
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-w); background: var(--sidebar-bg);
  display: flex; flex-direction: column; align-items: center;
  padding: 12px 0; gap: 4px; flex-shrink: 0;
}
.nav-item {
  width: 56px; padding: 10px 0; display: flex; flex-direction: column;
  align-items: center; gap: 3px; background: none; border: none;
  color: var(--sidebar-text); cursor: pointer; border-radius: var(--radius);
  transition: all var(--transition); font-size: 11px;
}
.nav-item:hover { background: rgba(255,255,255,0.08); color: #fff; }
.nav-item.active { color: #fff; background: rgba(74,144,217,0.25); }
.nav-item.active .nav-icon { filter: none; }
.nav-icon { font-size: 20px; line-height: 1; }
.nav-label { font-size: 11px; }
.sidebar-spacer { flex: 1; }

/* ── Content Area ── */
.content-area {
  flex: 1; overflow: hidden; display: flex; position: relative;
}
.view { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.view.hidden { display: none; }

/* ══════════ Write View ══════════ */
.write-view { flex-direction: row; }

/* Chapter List Panel */
.chapter-list-panel {
  width: var(--chapter-list-w); border-right: 1px solid var(--border);
  background: var(--surface); display: flex; flex-direction: column; flex-shrink: 0;
}
.panel-header {
  padding: 12px; display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
}
.panel-header h3 { font-size: 14px; font-weight: 600; }
.chapter-list { flex: 1; overflow-y: auto; padding: 8px; }
.chapter-item {
  display: flex; align-items: center; padding: 8px 10px;
  border-radius: var(--radius-sm); cursor: pointer; gap: 8px;
  margin-bottom: 2px; transition: all var(--transition);
  border: 1px solid transparent;
}
.chapter-item:hover { background: var(--surface-hover); }
.chapter-item.active {
  background: var(--primary-light); border-color: var(--primary);
  color: var(--primary);
}
.chapter-item .ch-name {
  flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: 13px;
}
.chapter-item .ch-words {
  font-size: 11px; color: var(--text-muted); flex-shrink: 0;
}

/* Editor Panel */
.editor-panel {
  flex: 1; display: flex; flex-direction: column; background: var(--bg);
  overflow: hidden;
}
.editor-topbar {
  padding: 12px 20px 0; display: flex; align-items: center; gap: 12px;
}
.chapter-title-input {
  flex: 1; border: none; background: transparent; font-size: 22px;
  font-weight: 700; outline: none; padding: 4px 0; color: var(--text);
}
.chapter-title-input::placeholder { color: var(--text-muted); }
.editor-actions { display: flex; gap: 4px; }
.chapter-goal-bar {
  padding: 8px 20px; display: flex; align-items: center; gap: 8px;
}
.chapter-goal-bar label {
  font-size: 12px; color: var(--text-muted); flex-shrink: 0;
  padding: 2px 8px; border: 1px solid var(--border); border-radius: var(--radius-sm);
}
.chapter-goal-bar input {
  flex: 1; border: none; background: transparent; font-size: 13px;
  outline: none; color: var(--text-secondary); padding: 4px 0;
}
.editor-wrap { flex: 1; padding: 8px 20px 0; overflow: hidden; display: flex; }
#editor {
  flex: 1; border: none; background: transparent; resize: none;
  font-family: var(--font-editor); font-size: 16px; line-height: 1.9;
  color: var(--text); outline: none; padding: 8px 0;
  letter-spacing: 0.02em;
}
#editor::placeholder { color: var(--text-muted); }
.editor-statusbar {
  padding: 6px 20px; display: flex; justify-content: space-between;
  font-size: 12px; color: var(--text-muted); border-top: 1px solid var(--border-light);
}
.save-status { transition: color var(--transition); }
.save-status.saving { color: var(--warning); }
.save-status.saved { color: var(--success); }
.save-status.error { color: var(--danger); }

/* ══════════ AI Panel ══════════ */
.ai-panel {
  width: var(--ai-panel-w); background: var(--surface);
  border-left: 1px solid var(--border); display: flex; flex-direction: column;
  flex-shrink: 0; overflow: hidden;
}
.ai-panel.collapsed { display: none; }
.ai-header {
  padding: 12px 16px; display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
}
.ai-header h3 { font-size: 14px; font-weight: 600; }
.ai-body { flex: 1; overflow-y: auto; padding: 12px 16px; }
.ai-actions { display: flex; gap: 6px; margin: 12px 0; }
.context-toggles { display: flex; flex-direction: column; gap: 6px; }
.toggle {
  display: flex; align-items: center; gap: 6px; font-size: 13px;
  color: var(--text-secondary); cursor: pointer;
}
.toggle input[type="checkbox"] {
  accent-color: var(--primary); width: 15px; height: 15px; cursor: pointer;
}

/* Draft Preview */
.draft-section {
  margin-top: 16px; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.draft-section.hidden { display: none; }
.draft-header {
  padding: 8px 12px; background: var(--primary-light);
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
}
.draft-header h4 { font-size: 13px; color: var(--primary); font-weight: 600; }
.draft-loading { font-size: 12px; color: var(--warning); animation: pulse 1.2s infinite; }
.draft-loading.hidden { display: none; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }
.draft-content {
  padding: 12px; font-size: 14px; line-height: 1.8; max-height: 300px;
  overflow-y: auto; white-space: pre-wrap; color: var(--text);
  font-family: var(--font-editor);
}
.draft-actions {
  padding: 8px 12px; display: flex; gap: 8px; border-top: 1px solid var(--border-light);
  background: var(--surface-hover);
}

/* ══════════ Outline View ══════════ */
.outline-view { padding: 0; }
.outline-content {
  flex: 1; overflow-y: auto; padding: 24px 32px; max-width: 800px;
}
.outline-content .form-group { margin-bottom: 20px; }
.outline-content textarea {
  width: 100%; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px; font-size: 14px; line-height: 1.8; resize: vertical;
  outline: none; transition: border-color var(--transition);
  font-family: var(--font-editor);
}
.outline-content textarea:focus { border-color: var(--primary); }
.chapter-outline-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 12px;
}
.chapter-outline-card h4 {
  font-size: 14px; font-weight: 600; margin-bottom: 8px; color: var(--text);
}
.chapter-outline-card textarea {
  width: 100%; border: 1px solid var(--border-light); border-radius: var(--radius-sm);
  padding: 8px; font-size: 13px; resize: vertical; min-height: 60px;
  outline: none; font-family: var(--font-sans);
}
.chapter-outline-card textarea:focus { border-color: var(--primary); }

/* ══════════ Cards View ══════════ */
.cards-view { padding: 24px 32px; overflow-y: auto; }
.view-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.view-header h2 { font-size: 20px; font-weight: 700; }
.cards-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 16px 20px;
  transition: box-shadow var(--transition), border-color var(--transition);
  position: relative;
}
.card:hover { box-shadow: var(--shadow); border-color: var(--primary); }
.card-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 10px;
}
.card-title {
  font-size: 16px; font-weight: 700; color: var(--text);
  word-break: break-word;
}
.card-actions { display: flex; gap: 4px; flex-shrink: 0; margin-left: 8px; }
.card-actions .btn { padding: 2px 6px; font-size: 12px; }
.card-body { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.card-field { margin-bottom: 6px; }
.card-field-label {
  font-size: 11px; color: var(--text-muted); font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 2px;
}
.card-field-value { white-space: pre-wrap; word-break: break-word; }
.card-empty {
  display: flex; align-items: center; justify-content: center;
  padding: 48px; color: var(--text-muted); font-size: 14px;
  grid-column: 1 / -1; text-align: center;
}

/* ══════════ Settings View ══════════ */
.settings-view { padding: 24px 32px; overflow-y: auto; }
.settings-content { max-width: 700px; }
.settings-section { margin-bottom: 32px; }
.settings-section h3 { font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.section-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
}
.models-list { display: flex; flex-direction: column; gap: 12px; }
.model-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; position: relative;
}
.model-card.active { border-color: var(--primary); background: var(--primary-light); }
.model-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.model-name { font-weight: 600; font-size: 15px; }
.model-detail { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.model-actions { display: flex; gap: 6px; }
.settings-actions { display: flex; gap: 12px; }

/* ══════════ Modal ══════════ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; backdrop-filter: blur(2px);
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); width: 520px; max-width: 90vw;
  max-height: 85vh; display: flex; flex-direction: column;
}
.modal-sm { width: 380px; }
.modal-header {
  padding: 16px 20px; display: flex; align-items: center;
  justify-content: space-between; border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-close {
  background: none; border: none; font-size: 18px; color: var(--text-muted);
  cursor: pointer; padding: 4px; line-height: 1;
}
.modal-close:hover { color: var(--text); }
.modal-body {
  padding: 20px; overflow-y: auto; flex: 1;
}
.modal-footer {
  padding: 12px 20px; display: flex; justify-content: flex-end; gap: 8px;
  border-top: 1px solid var(--border);
}

/* ── Forms ── */
.form-group {
  margin-bottom: 14px;
}
.form-group label {
  display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 8px 12px; font-size: 14px; outline: none;
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px rgba(74,144,217,0.1);
}
.form-group textarea { resize: vertical; min-height: 60px; line-height: 1.6; }
.form-row { display: flex; gap: 12px; }
.form-row .form-group { flex: 1; }

/* ══════════ Utilities ══════════ */
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mb-8 { margin-bottom: 8px; }

/* ══════════ Empty States ══════════ */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; padding: 40px 20px; color: var(--text-muted);
  text-align: center; gap: 8px;
}
.empty-state .empty-icon { font-size: 36px; opacity: 0.5; }
.empty-state p { font-size: 14px; }

/* ══════════ AI Enhance (Outline + Card Modal) ══════════ */
.label-row {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 6px;
}
.label-row label { margin-bottom: 0; }
.btn-ai-enhance {
  font-size: 12px; padding: 2px 10px; background: var(--primary-light);
  color: var(--primary); border: 1px solid transparent; border-radius: var(--radius-sm);
  cursor: pointer; transition: all var(--transition); white-space: nowrap;
}
.btn-ai-enhance:hover { background: var(--primary); color: #fff; }
.btn-ai-enhance:disabled { opacity: 0.5; cursor: not-allowed; }
.ai-enhance-preview {
  margin-top: 8px; border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden;
}
.ai-enhance-preview.hidden { display: none; }
.ai-enhance-header {
  padding: 6px 10px; background: var(--primary-light); display: flex;
  align-items: center; justify-content: space-between; font-size: 12px;
  color: var(--primary); font-weight: 600; border-bottom: 1px solid var(--border-light);
}
.ai-enhance-loading {
  font-size: 12px; color: var(--warning); animation: pulse 1.2s infinite;
}
.ai-enhance-loading.hidden { display: none; }
.ai-enhance-content {
  padding: 10px; font-size: 13px; line-height: 1.7; max-height: 200px;
  overflow-y: auto; white-space: pre-wrap; color: var(--text);
}
.ai-enhance-actions {
  padding: 6px 10px; display: flex; gap: 6px; border-top: 1px solid var(--border-light);
  background: var(--surface-hover);
}

/* ══════════ Model Connection Test ══════════ */
.btn-test-model {
  background: var(--success-light); color: var(--success);
  border-color: transparent;
}
.btn-test-model:hover { background: var(--success); color: #fff; }
.btn-test-connection {
  background: var(--primary-light); color: var(--primary);
  border-color: transparent; margin-top: 4px;
}
.btn-test-connection:hover { background: var(--primary); color: #fff; }
.model-test-area { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border-light); }
.model-test-result {
  margin-top: 8px; padding: 10px 12px; border-radius: var(--radius-sm);
  font-size: 13px; line-height: 1.6;
}
.model-test-result.hidden { display: none; }
.model-test-result.test-loading { background: var(--primary-light); color: var(--primary); animation: pulse 1.2s infinite; }
.model-test-result.test-success { background: var(--success-light); color: var(--success); }
.model-test-result.test-fail { background: var(--danger-light); color: var(--danger); }
.model-test-result.test-warn { background: #FFFFF0; color: var(--warning); }
.test-meta { font-size: 12px; opacity: 0.8; }
.test-detail { display: block; margin-top: 2px; font-size: 12px; opacity: 0.85; word-break: break-all; }

/* ══════════ Auth Page (Login / Register) ══════════ */
.auth-page {
  position: fixed; inset: 0; z-index: 9999;
  background: linear-gradient(135deg, #1E293B 0%, #334155 50%, #1E293B 100%);
  display: flex; align-items: center; justify-content: center;
}
.auth-page.hidden { display: none; }
.auth-card {
  background: var(--surface); border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3); padding: 40px 36px;
  width: 380px; max-width: 90vw; text-align: center;
}
.auth-logo {
  font-size: 36px; font-weight: 700; color: var(--primary);
  letter-spacing: 4px; margin-bottom: 4px;
}
.auth-subtitle {
  font-size: 14px; color: var(--text-muted); margin-bottom: 28px;
}
.auth-form { transition: opacity 0.3s; }
.auth-form .form-group { text-align: left; }
.auth-form .form-group input {
  width: 100%; padding: 10px 14px; font-size: 15px;
}
.auth-error {
  padding: 8px 12px; background: var(--danger-light); color: var(--danger);
  border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 12px;
  text-align: left;
}
.auth-error.hidden { display: none; }
.auth-loading {
  padding: 16px; color: var(--primary); font-size: 14px;
  animation: pulse 1.2s infinite;
}
.auth-loading.hidden { display: none; }

/* ── User Info in Topbar ── */
.user-info {
  display: flex; align-items: center; gap: 8px; margin-left: 8px;
  padding-left: 12px; border-left: 1px solid var(--border);
}
.user-name {
  font-size: 13px; color: var(--text-secondary); max-width: 100px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* ══════════ Responsive ══════════ */
@media (max-width: 1100px) {
  :root { --ai-panel-w: 280px; --chapter-list-w: 180px; }
}
@media (max-width: 860px) {
  :root { --ai-panel-w: 240px; --chapter-list-w: 160px; }
  .ai-panel { font-size: 13px; }
}